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Investments in Unconsolidated Affiliates - Financial Results of Four Largest Unconsolidated Affiliates (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
WAVE | Discontinued Operations Held for Sale      
Investments in and Advances to Affiliates [Line Items]      
Net income attributable to discontinued operations $ 2,226 $ 6,775 $ 8,930